Cr:YAG, or chromium-doped yttrium aluminum garnet, is a laser active crystal that is commonly used in solid-state lasers. Cr:YAG has a cubic crystal structure and is doped with chromium ions, which allow it to amplify light through stimulated emission.
One of the main advantages of Cr:YAG as a laser active crystal is its ability to generate laser emissions at a wavelength of 1064 nanometers, which is the same as Nd:YAG lasers. However, Cr:YAG lasers have several advantages over Nd:YAG lasers, such as a wider absorption bandwidth and a higher efficiency for generating short pulses.
Cr:YAG lasers are typically pumped by a flashlamp or a diode laser, which excites the chromium ions in the crystal and causes them to emit light at a longer wavelength. Cr:YAG lasers can also be mode-locked, which allows them to generate ultra-short pulses in the picosecond or femtosecond range.
Cr:YAG lasers are used in a variety of applications, such as laser marking, welding, and cutting of metals and ceramics. They are also used in scientific research, particularly in the field of ultrafast laser spectroscopy.
|Thermal conductivity, W x °K-1 x cm-1||0.12|
|Termooptical factor (dn/dt)||8.0 x 10-6 x °K-1|
|Operating transition||3A2 - 3T2|
|Absorption band, nm||900 - 1150|
|Emission band, nm||1340 - 1580|
|Dopant level, at/cm3||1017 - 1018|
|Damage threshold at 1064 nm, 10 ns, MW/cm2||500|
|Upper-level lifetime at 300°K, ms||3.6|
|Quantum yield at 300°K, %||12|
|Absorption cross section at 1064 nm, cm2||5.0 x 10-18|
|Emission cross section at 1420 nm, cm2||4.5 x 10-19|